Purification of hydrogen.



C. BOSCH & W. WILD.

PURIHGATION 0F HYDROGEN.

APlLIGATIDN FILED DEG. 4, 1913 1,133,087. Patentedv Mam, 1915.

Immun, lill-MNHN UNITED STATES lPATENT oEFIcE.

CARL Bosca AND WILHELM WILD, or LUDWIGs-HArEn-oN-THE-RHINE, GERMANY,

AssIeNons To nanrscnn ANILIN a sona FABRIK, or LUnwrGsmFEN-oN-THE- BHINE, GERMANY, A CORPORATION.

v PUBIFICATION 0F EYDROGEN.

' appnauon mea December 4, 191s. serial No. 804,669.

T all whom it may concern."

`Be it known that we, CARL Boscn and IVILHELM WILD, citizens of the German Empire, residing at Ludwigshafen-on-the- Rhine, Germany, have invented new and useful Improvements in the Purification of Hydrogen, of which the following is a speciication. We have found that by treating hydrogen v(under which term we include both hydrogen itself and also mixtures of hydrogen with other gases) under pressure exceeding that of -five atmospheres with a hot solution of fixed caustic alkali, sulfur and compounds containing sulfur can be 'practically completely removed therefrom. The'concentration of the alkaline solution and the temperature and pressure employed can be varied within wide limits, and the invention is not limited to any particulardetails in these respects. As 'an ewxample, however,we -may say that a caustic soda solution of from to 50% can be employed at. a

temperature of from,150o to 225 C. and a pressure of atmospheres. As a rule, if

accompanying this specifi;

through the pipe D., The gases containing hydrogen which lare to be puriied are umped under pressure through the pipe bubble through the column of liquid 1n the absorption cylinder A and leave in a purified condition through the pipe F. Surrounding the absorption cylinder A is a jacket Band into this jacket steam is passed through the pipe G, in order to heat up the caustic soda solution to the necessary temperature. 'Iahe condensed water and any surplus-steam leave the jacket through the pipel H. The hydrogen, or gases containing hydrogen, thus puriiied can be used for any purpose to which it is, or they are, applicable, for instance for the catalytic production of ammonia or for-the hydrogenization ofl organic compounds .or for the production of methane for carbon monoxid.

Now what we claim is 1. The processof freeing hydrogen from sulfur by treating hydrogen containing sulfur under a pressure exceeding that of ive atmospheres with a hot solution of fixed caustic alkali.

2. The process of freeing hydrogen from sulfur by treating hydrogen containing sulfur and at a pressure of fifty atmospheres with 10% to 50% solution'of caustic soda maintained at a temperature of from to 225 C.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

. CARL BOSCH. WILHELM WILD.

Witnesses:

J. ALLG. LLOYD,

S. S. BERGER. 

